1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
#include "wav.h"
#include "smrt_arena.h"
#include <assert.h>
#include <stdio.h>
#include <string.h>
void seek_to_chunk(FILE *file, char *chunk_name) {
char cur_name[4];
u32 chunk_size;
fseek(file, sizeof(wav_master_chunk_t), SEEK_SET);
while (true) {
fread(cur_name, 4, 1, file);
fread(&chunk_size, 4, 1, file);
if (strcmp(cur_name, chunk_name) == 0) {
break;
}
fseek(file, chunk_size, SEEK_CUR);
}
fseek(file, -8, SEEK_CUR);
}
wav_data_t *load_wav_file(smrt_arena_t *arena, char *filename, wav_master_chunk_t *master_o, wav_fmt_chunk_t *format_o) {
FILE *wav_file = fopen(filename, "rb");
if (!wav_file) {
return NULL;
}
fread(master_o, sizeof(wav_master_chunk_t), 1, wav_file);
seek_to_chunk(wav_file, "fmt ");
fread(format_o, sizeof(wav_fmt_chunk_t), 1, wav_file);
seek_to_chunk(wav_file, "data");
fseek(wav_file, 4, SEEK_CUR);
u32 sampled_data_size;
fread(&sampled_data_size, 4, 1, wav_file);
wav_data_t *data = smrt_arena_push(arena, sizeof(wav_data_t) + sampled_data_size, true);
fread((u8*)data+WAV_DATA_BASE_POS, sampled_data_size, 1, wav_file);
data->sample_count = sampled_data_size / ((format_o->bits_per_sample / 8) * format_o->num_channels);
return data;
}
void write_wav_file(char *filename, wav_fmt_chunk_t *header_i, wav_data_t *data_i);
wav_fmt_chunk_t make_wav_fmt_chunk(u32 num_channels, u32 sample_rate, u16 bits_per_sample, wav_data_t *data_i);
|
